Excuse me but I don't understand why full size aircraft and professional practices are included here.
As far as RC air planes and the OP, a lot will depend on the airplane you are flying. Take it up high and practice rudder only, aileron only, (elevator will be needed), aileron & rudder the same side, aileron & rudder opposite. Normally, small heading changes involve small amounts of rudder, turns in general will be aileron and elevator, BUT depending largely upon the amount of dihedral, the airfoil, air speed, and whatever you feel comfortable with for any given model, just do it. Unless you are heading towards the goal of becoming a "pro" flyer, getting the plane up and down in one piece counts the most to start.